Necros op huh? in 1 vs1 they are good but add in another and call target on necro and it gets ugly for nec. They have little to no CC defence. It just so happens fear and cc is a good way to protect ourselves even over DS. Which is why necs might use nightmare runes. And while we may have the 1 vs 1 advantage in many cases, necros have poor mobility(unlike warrior) and get focus fired down quickly in team fights. You have to consider the weaknesses vs advantages. Like the whole ranger uproar being op. Sure, they are good at ranged burst damage now, but what happens when you attack them up close?